高考英语语法精讲精练专题 13虚拟语气与情态动词

语法专题十三：虚拟语气与情态动词

情态动词和虚拟语气是高考重要考点，《2017年普通高等学校招生全国统一考试大纲》附录语法项目表中列出了虚拟语气以及情态动词。

2015年高考全国卷Ⅰ第79题（短文改错）考查了情态动词must后面接动词原形。

2016年高考全国卷Ⅰ没有考查情态动词与虚拟语气。

2017年高考全国卷Ⅰ没有考查情态动词与虚拟语气。

知识框架

一. 含有条件状语从句的复合句(以do为例;S=主语)

例如:

①If I were you, I would apply for the job.

②If I had the money, I would buy it.

③If I were given another chance，I would do it better.

④If I had taken your advice, I would have made great progress.

⑤If it had not been for your help, I wouldn’t have finished the work so easily.

⑥If it should rain tomorrow,I would stay at home all day.

⑦If you were to come tomorrow,I could wait for you at home.

注意：在书面语中，条件从句可以不用连词if，而将谓语中的were，had或 should 等移至主语之前构成倒装句。例如：

①Were I you, I would apply for the job.

②Had I taken your advice, I would have made great progress.

③Should it rain tomorrow,I would stay at home all day.

二、错综时间的条件句

虚拟条件句中的主句和从句涉及的动作发生的时间不一致，这时主句和从句的谓语形式应按照各自动作发生的实际时间来表达。例如：

①If you hadn't watched TV yesterday, you wouldn't be so sleepy now. （从句yesterday说明过去，主句now说明现在）

②If they had left home early this morning, they would arrive in half an hour. （从句说明过去，主句说明将来。）

③If you hesitated this moment, you might suffer in the future. （从句说明现在，主句说明将来）

三、含蓄条件句

非真实条件句中的条件从句有时不表达出来，只暗含在上下文中，这种句子叫做含蓄条件句。含蓄条件句有三种情况：

1．条件暗含在单词短语中：常见介词有with假如有, without假如没有, but for要不是因为；连词有or/ otherwise （前句用陈述语气，后句用虚拟）；but（前句为虚拟，后句陈述）例如：

①He would not get such a result without your help. (条件暗含在介词短语without your help= if you hadn’t helped him中)

②But for you, I could not be recovered so soon. (条件暗含在But for you= If you hadn’t helped me中)

③He must have been there, or he never could know the place so well.(暗含条件是连词or；后句为虚拟)

④I would have been to your place, but I was really too busy.

=I was really too busy, or/ otherwise I would have been to your place.

⑤She was ill, otherwise she would have been present at the meeting. （条件通过连词otherwise/ or表示出来 If she had not been ill...）

2．条件可根据上下文推理出

①They could have won.(条件可能是if they had been patient )

②Such mistakes could have been avoided.（条件可能是if you had been more careful ）

③Why didn't you tell me about it I should have helped you.（条件可能是if you had told me about it）

④-- Did you go to see him yesterday?

-- I would have, but someone come to visit me.（条件是if no one had come to visit me）

3．条件用其他形式来表示

①Suppose you were in my shoes, what would you do? （用suppose/ supposing/ providing等词表示if）

②To talk with her, you would know she could not hear well.（不定式有假设的意思，相当于If you should talk with her...）

③Left to himself, he could not have finished the work.（动词的-ed形式表示条件 If he had been left to himself...）

二. 虚拟语气用在宾语从句中

sb. did（were）…（表现在）

1. wish+that sb. had done… （表过去）

sb. would/could do…（表将来）

例如：

①I wish I knew his address.

②I wish he hadn’t been rude to his parents.

③He wishes we would go with him.

2.would rather后的从句要用虚拟语气。

例如：

①I’d rather you posted the letter right away. (现在)

②I’d rather I hadn’t said such unkind things to you.（过去）

③I'd rather you came here for the answer tomorrow .（将来）

3. 表示“坚持、建议、决定、要求、命令”（“坚决要命”）等主观意向的动词之后的宾语从句，谓语用should ＋do，should可省略(注意：被动语态用should+be+done)。这类词有：insist，suggest，advise，recommend，propose，decide，determine，demand，request，require，desire，order，command等。例如：

①The expert proposed that TV should be turned off at least one hour every day.

②Experiments demand that accurate measurements be made.

③She insisted that we should take up the matter at the meeting.

注意：

1. suggest 表示“暗示、表明”时，用陈述语气。

2. insist 表示“坚持说、坚持认为（某个事实）”时，用陈述语气。例如：

①Your pale face suggests that you are ill.

②He insisted that he hadn’t stolen the money.

三. 虚拟语气用在主语从句中

It is demanded / necessary / a pity + that…等结构的主语从句，谓语动词用should do，should 可省略。

(注意：被动语态用should+be+done)。